Sorry for the delay in replying as I've been away for a while.
The nannochloropsis was originally started from a culture from Florida Aqua Farms. I have since restarted with a concentrate from ReefCrew.
I use FAF's F/2 fertilizer and found more success with fewer crashes than when I used Miracle grow.
While I sterilize the containers between batches using bleach.
I don't sterilize the water.
The water is made up of sodium chloride water softener salt, the purified by evaporation kind as it's the cleanest. I use about 10 parts sodium chloride to one part of Epsom salts by weight. It probably works close enough to go by volume.
Specific gravity I chose to use is 1.017, same as my brine shrimp.
As for feeding the fry, I've not had any luck switching them over to frozen foods..
I started at 4 weeks of age using cyclopeeze and shaved mysis, but now, at 4 1/2 and 5 1/2 months of age, there are very few eating any commercial food that is frozen. The few that do, eat very little of it.
I started freezing my live brine and they eat that, and now that I'm back, I hope to get back to the attempt to get them on commercial frozen.
In my visits to the "org", I haven't found anyone else that has this problem of switching them over so I don't know why I can't succeed.